The Simpsons Episode 17.03 Milhouse of Sand and Fog

Homer capitalizes on Maggie's Chicken Pox by throwing a Pox party and charging parents to infect their children. Kirk and Luann run into each other at the party and have a "Marge-arita" assisted hook-up which ignites a "trial un-separation". Milhouse soon realizes he was better off when his parents competed for his love and launches "Operation Reverse Parent Trap." Inspired by an episode of THE OC, Milhouse and Bart plant one of Marge's bras in Kirk's closet which causes Luann to confront Homer and break-up his marriage. Bart and Milhouse's plan to correct the situation with a poorly thought out scheme (Homer and Marge will reunite over the tragedy of seeing a dummy of Bart fall from a cliff into a raging river) goes awry and The Simpson parents must join together to save Bart from the rapids.